394564361820 has 48 divisors (see below), whose sum is σ = 1131726079008. Its totient is φ = 102650890240.

The previous prime is 394564361743. The next prime is 394564361839. The reversal of 394564361820 is 28163465493.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80193549 + ... + 80198468.

It is an arithmetic number, because the mean of its divisors is an integer number (23577626646).

Almost surely, 2^394564361820 is an apocalyptic number.

394564361820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394564361820 is an abundant number, since it is smaller than the sum of its proper divisors (737161717188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394564361820 is a wasteful number, since it uses less digits than its factorization.

394564361820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160392070 (or 160392068 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 394564361820 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred sixty-one thousand, eight hundred twenty".